Basics of Geometry

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Across
  1. 3. the term describing the angles shown in figure A
  2. 5. a flat surface that extends without end and has no thickness
  3. 7. the type of angles shown in Fig D
  4. 9. the common endpoint of two rays forming an angle
  5. 10. the two rays shown in Figure C
  6. 13. three or more points which lie on the same line
  7. 15. two angles that add up to 180°
  8. 19. the two supplementary angles shown in Fig B are called this
  9. 20. an angle measuring less than 90°
  10. 21. these form the sides of every angle
Down
  1. 1. an angle measuring 180°
  2. 2. an angle measuring more than 90°
  3. 4. the ray which splits an angle into two congruent angles is an angle _?_
  4. 6. an a straight path that extends in two opposite directions without end and has no thickness
  5. 8. two angles that add to 90°
  6. 11. figures which are identical in size and shape are _?_
  7. 12. this point divides a segment into two congruent parts
  8. 14. a part of a line consisting of an endpoint and all points on one side of the line containing the endpoint
  9. 15. part of a line consisting of two endpoints and all points in between
  10. 16. the tool used to measure angles
  11. 17. points which lie on the same plane
  12. 18. a location in space